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← ScienceWhich constraint affects carbon nanotube transistors at cryogenic temperatures?
A)Phonon bottleneck reduces thermal conductivity
B)Increased carrier freeze-out depletes charge✓
C)Quantum tunneling resistance decreases sharply
D)Grain boundaries facilitate electron mobility
💡 Explanation
Increased carrier freeze-out occurs because decreased thermal energy reduces intrinsic excitation above the bandgap; therefore the depletion of charge carriers increases ON resistance, rather than quantum tunneling dominating because this requires lower temperature still.
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